How to show the selected value from drop down from one page

Hi Friends,


i m creating one web application my requirements are

1)country: Default label

2)States : COMBO BOX
(when i choose the value from the box the page ll be redirect)



for example:


country : INDIA


states : list show "TN,PONDI"


when i choose pondi ll redirect into "pondi.aspx"

but my drop down box was not show the selected value(i.e combo box again showed --- select--- but i need selected "PONDI" in combo after page redirect)



my codes for combobox:


Select Country:  



Select State:  
--select--
Pondicherry
Tamil Nadu




in c#:


protected void ddlstate_SelectedIndexChanged(object sender, EventArgs e)
{
if (ddlstate.SelectedItem.Text == "Pondicherry")
{

Server.Transfer("Pondi.aspx?ddlstateonnextpage" + AB);
}
else if (ddlstate.SelectedItem.Text == "Tamil Nadu")
{
Server.Transfer("TN.aspx?ddlstateonnextpage" + AB);
}



}

}





how to make code?

thanks & Regards

rocky